use lists:keysearch BIF to traverse ejson
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Key: COUCHDB-747
URL: https://issues.apache.org/jira/browse/COUCHDB-747
Project: CouchDB
Issue Type: Improvement
Components: Database Core
Affects Versions: 0.11
Reporter: Adam Kocoloski
Fix For: 1.1
We use proplists:get_value to inspect JSON Objects in Erlang. I think we should switch to lists:keysearch. It's a BIF and appears to be 2-3x faster than proplists for a wide class of lookups. Here's a microbenchmark:
http://gist.github.com/374220
The get_value() functions in that gist provide a wrapper around keysearch to give it the same interface as proplists:get_value. The only incompatibility in the wrapper is that proplists will find atoms (instead of tuples) in the list, while keysearch will ignore them. But our JSON term format doesn't contain any standalone atoms, so this is not an issue for us.
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